If they went with the Mac application model instead of fighting it, you can open up Interface Builder and put a Webview in a tab without writing a single line of code.
It would make absolute sense to use Webview when the whole point of a Chrome browser is to use their own engine.
If it really says "Aw Snap" when a web page doesn't load properly, I might have to make the switch...
It's done that on the Windows version since day one.